Author Question: A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform ... (Read 69 times)

Arii_bell · **on:** Jul 28, 2018

A 400-turn circular coil (radius = 1.0 cm) is oriented with its plane perpendicular to a uniform magnetic field which has a magnitude that varies sinusoidally with a frequency of 90 Hz. If the maximum value of the induced emf in the coil is observed to be 4.2 V, what is the maximum value of the magnitude of the varying magnetic field?
a. 59 mT
b. 62 mT
c. 65 mT
d. 68 mT
e. 31 mT

Question 2

A 40-turn circular coil (radius = 4.0 cm, total resistance = 0.20 W) is placed in a uniform magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies with time as given by B = 50 sin(10 pt) mT where t is measured in s. What is the magnitude of the induced current in the coil at 0.10 s?
a. 50 mA
b. 1.6 A
c. 0.32 A
d. zero
e. 0.80 A